CVE-2026-107764

HIGH 7.2

SiteOrigin CSS <= 1.6.7 - Unauthenticated Stored DOM-Based Cross-Site Scripting via Comment Author URL via Inspector href Sink

CVSS Score

7.2

EPSS Score

0.0%

EPSS Percentile

0th

The SiteOrigin CSS plugin for WordPress is vulnerable to Stored DOM-Based Cross-Site Scripting via the 'url (comment_author_url)' parameter in all versions up to, and including, 1.6.7 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This is possible because WordPress core's esc_url() preserves HTML entity-encoded characters, allowing a crafted entity-encoded payload in the comment 'Website' field to survive storage and be DOM-decoded by the browser into executable markup at the sink.

CWE	CWE-79
Vendor	gpriday
Product	siteorigin css
Published	Oct 16, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Scope

Confidentiality

Integrity

Availability

Affected Versions

gpriday / SiteOrigin CSS

0 ≤ 1.6.7

References

NVD ↗ CVE.org ↗ EPSS Data ↗

wordfence.com: https://www.wordfence.com/threat-intel/vulnerabilities/id/b0ff9652-1b45-43d6-949a-92bfeaee96d3?source=cve plugins.trac.wordpress.org: https://plugins.trac.wordpress.org/browser/so-css/tags/1.6.6/js/inspector.js#L280 plugins.trac.wordpress.org: https://plugins.trac.wordpress.org/browser/so-css/tags/1.6.6/so-css.php#L69 plugins.trac.wordpress.org: https://plugins.trac.wordpress.org/browser/so-css/tags/1.6.6/so-css.php#L899 github.com: https://github.com/siteorigin/so-css/compare/1.6.7...1.6.8

Credits

Jakub Herman